法華玄論 3.99

3.99

問：四經同明因果，何故《涅槃》具明緣正兩因、緣正兩果，緣因即因與因因，緣果即果與果果等五性之義，而餘經不明此耶？

Question: The four sūtras equally explain cause and fruit; why is it that the Mahāparinirvāṇa-sūtra fully explains the five natures—the two causes of condition and primary, and the two fruits of condition and primary, where the conditioning cause is cause and cause-of-cause, and the conditioning fruit is fruit and fruit-of-fruit—whereas the other sūtras do not clarify this?